粗碟菊石

粗碟菊石（學名：），又名厚盤菊石、厚圓盤菊石，是生存於晚白堊紀的一屬菊石，生活在開闊的海域中，游水能力很強。本屬下包括有菊石界中的巨物，殼長達2公尺。國際地層委員會將本屬下Pachydiscus neubergicus化石的訂為白堊紀-{馬斯垂克期}-開始的標誌。

特徵
粗碟菊石屬大型菊石，外殼均勻內旋並壓縮，上有短小、微彎的肋條。腹是圓形的。

物種
*Joaquinites fascicostatum
*Pachydiscus (Neodesmoceras)
*Pachydiscus (Pachydiscus)
*Pachydiscus (Parapachydiscus) gardneri
*Pachydiscus (Parapachydiscus) woodringi
*Pachydiscus ashlandicus
*Pachydiscus averilli
*Pachydiscus epiplectus
*Pachydiscus excelsus
*Pachydiscus flexuosus
*Pachydiscus gollevillensis
*Pachydiscus hauthali
*Pachydiscus naumanni
*Pachydiscus neubergicus
*Pachydiscus oregonensis
*Pachydiscus patagonicus
*Pachydiscus riccardi
*Pachydiscus stallauensis
*Pachydiscus steinmanni
*Parapachydiscus albuquerquei
*Parapachydiscus arionis
*Parapachydiscus athena
*Parapachydiscus bidwelli
*Parapachydiscus brasiliensis
*Parapachydiscus bruneti
*Parapachydiscus catarinae
*Parapachydiscus coalingensis
*Parapachydiscus cortinaensis
*Parapachydiscus endymion
*Parapachydiscus eurydice
*Parapachydiscus euzebioi
*Parapachydiscus gettyi
*Parapachydiscus hera
*Parapachydiscus hermes
*Parapachydiscus oceanus
*Parapachydiscus orpheus
*Parapachydiscus panochensis
*Parapachydiscus parahybensis
*Parapachydiscus peninsularis
*Parapachydiscus perseus
*Parapachydiscus poseidon
*Parapachydiscus psyche
*Parapachydiscus reedsi
*Parapachydiscus stanislausensis
*Parapachydiscus sumneri
*Parapachydiscus williamsoni

參考文獻
外部連結

• [http://paleodb.org/cgi-bin/bridge.pl?action=basicTaxonInfo&taxon_no=15309 Pachydiscus] in the Paleobiology Database

延伸閱讀

• , Part L, Ammonoidea. R.C. Moore, ed. Geological Soc. of America and Univ. Kansas press. p L377-L380.
• A Pictorial Guide to Fossils by Gerard Ramon Case
• Cephalopods Present and Past: New Insights and Fresh Perspectives by Neil H. Landman, Richard Arnold Davis, and Royal H. Mapes
• Kennedy, W. J. (1986). Campanian and Maastrichtian Ammonites from Northern Aquitaine, France (No. 36). Palaeontological association. page 30